Optional spine screws

[AstronIsTaken]

Out of curiosity (since I'm printing new v1.1.1(?) shuttle) I tried to add spine screws to v1.1 shuttle and, unfortunately, shuttle cracked in between layers. 2nd screw hole I predrilled with M3 reamer almost all the way and screw went in flawlessly.

It might be hard to achieve perfect tolerances for such a long horizontally printed screw holes, so it might be good idea to add a note to guide to use reamer before adding spine screws or increase screw holes diameter a bit.

[TheSin-]

this is a good point thought oddly the first time it's been brought up, I'll look into it.

[AstronIsTaken]

It might mean feature is not used at all you can just retire it. Or my tolerances are so bad or I had block stuck inside hole, so shuttle cracked

[TheSin-]

Oh I know it's used by many as we talk about it, that being said shuttles aren't printed as much as tool plates so once it's working....

[kiwidave72]

ive had a few issues, than i reprinted and reamer'ed out some plastic with a reamer until i could get the bushings in without craking. think this is more of a case by case thing as my printer isnt the best turned one in the world.

[john-f-chamberlain]

Did you use fully threaded screws or are they only partially threaded? When added the spine screws to mine I noticed the ABS discoloring due to stress caused by the partially threaded section being slightly wider than the threaded section. I would imagine under certain circumstances this could add enough stress to cause the part to split.

[TheSin-]

full thread, not shoulder bolts

[AstronIsTaken]

In my case I had partially threaded

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full thread

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[TheSin-]

maybe we will change the document to say fully threaded then. The issue is that you want it to be tight the entire length, I could open it half way for a shoulder but then the bottom wouldn't benefit from the spine as much. And the bottom needs it the most.

[Altirix]

yeah i actually had this happen to me with v1 because i used partially threadded screws on my first go. had way more of them. rummaged thru my misc unsorted screws and found fully threaded which were fine.

[TheSin-]

Added notes to use fully threaded https://github.com/DraftShift/StealthChanger/commit/f7f19c9c4d7fe11cdcacf678c8a3aee60b2f2538